Principal Security Engineer

reactor • United State

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AI Summary

Reactor is seeking a Principal Security Engineer to build its security program from the ground up. This role involves setting security strategy, protecting partner data, and leading security reviews. Key requirements include experience leading security at AI/cloud companies and hands-on coding skills.

Key Highlights

Build Reactor's security program from scratch.

Protect sensitive partner models and data.

Lead security reviews and compliance efforts.

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Key Responsibilities

Set Reactor's security strategy and own it end-to-end.

Protect the models and data our partners and customers trust us with.

Threat-model the platform and fix what you find.

Lead partner and customer security reviews and compliance work.

Represent Reactor's security work with partners, customers, and the wider security and AI community.

Build security into how the team ships.

Set up detection and incident response across the organization.

Technical Skills Required

Cloud-native infrastructure security Threat modeling Compliance frameworks (e.g., SOC 2)

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Benefits & Perks

Salary and equity at the 99th percentile

Visa sponsorship

Relocation support

Generous health, dental, and vision coverage

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Nice to Have

Experience securing model weights or ML infrastructure

Real-time or media infrastructure, anywhere p99 matters more than the average

GPU cluster security

Red team or offensive security experience

Job Description

Department: Engineering

Location: San Francisco

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Job Overview

Posted Date Oct 05, 2026

Employment Type Full-time

Experience Level Not Applicable

Location United State

Category Cyber Security

Company reactor

Mentioned Skills

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